USH1379H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supersonic fan nozzle for abrasive blasting media
Assignee: United States Department of the Air Force
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Filing: 1992-11-16
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Granted: 1994-12-06
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Expires: 2012-11-16
Abstract
Abstract A supersonic fan nozzle for abrasive blast removal of coatings particularly for use with plastic abrasive media, provides much greater media particle velocity, a more uniform velocity profile, and a more uniform media particle distribution than prior art nozzles. The new nozzle has a constant height throat area about 1 inch long, about 1.57 inches wide, and about 0.125 inche high. The throat opens into a constant height diverging slot which diverges at about a 6.5 degree half-angle for about 9.5 inches to a final exit width of about 3.75 inches. A nozzle-to-hose coupling connects at one end to a conventionally sized blasting hose and at the other by a rectangular opening to the throat. Used with light plastic media entrained in an airflow stream at operating pressures of 15 to 80 psig, the nozzle has successfully removed coatings from a variety of delicate underlying substrates with little or no observable damage to the substrates. In tests, it has produced minimal residual stress effects on substrates while increasing production stripping rates by 50-200% . Tests have shown that the optimum range of dimensions for the new nozzle are a slot exit area to throat area ratio about 2.2 to about 2.5 and a constant divergence half-angle of about 5 to about 8 degrees.
Inventors
- 👤 Gary D. Meuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:26
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B24C5/00; B24C5/02; B24C5/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
A supersonic fan nozzle for removing coatings from delicate substrates by abrasive blasting without damaging the substrate, comprising: (a) an inlet for receiving a gasflow stream of abrasive media entrained in a pressurized gas; (b) a rectangular opening mated to the inlet; (c) a rectangular throat extending from the rectangular opening; and, (d) extending from the throat, a diverging slot outlet diverging at a constant divergence half-angle of about 5 to about 8 degrees, wherein the length of the slot outlet is determined by a slot outlet exit area to throat area ratio of about 2.2 to exactly 2.45.
Claim 2
Dependent Claim
99 words
A supersonic fan nozzle for removing coatings from delicate substrates by abrasive blasting without damaging the substrate, comprising: (a) an inlet for receiving a gasflow stream of abrasive media entrained in a pressurized gas; (b) a rectangular opening mated to the inlet; (c) a rectangular throat extending from the rectangular opening; and, (d) extending from the throat, a diverging slot outlet diverging at a constant divergence half-angle of about 5 to about 8 degrees, wherein the length of the slot outlet is determined by a slot outlet exit area to throat area ratio of about 2.2 to exactly 2.45.
Claim 3
Dependent Claim
77 words
The supersonic fan nozzle according to claim 1, wherein: (a) the rectangular opening is about 1.57 inches wide and about 0.060 inch to about 0.187 inch high; (b) the rectangular throat is about 1.57 inches wide, of constant height of about 0.060 to about 0.187 inch, and about 1 inch long; and, (c) the diverging slot outlet is of constant height of about 0.060 to about 0.187 inch and diverges from a width of about 1.57 inches.
Claim 4
Dependent Claim
56 words
The supersonic fan nozzle according to claim 1, wherein the rectangular opening, the rectangular throat and the diverging slot outlet are all three the same constant height of about 0.125 inches, and the diverging slot outlet diverges at a constant divergence half-angle of about 6.5 degrees to a slot outlet exit width of about 3.75 inches.
Claim 5
Independent Claim
141 words
A method for removing a coating from a substrate by abrasive blasting without damaging the substrate, comprising the steps of: (a) providing a supersonic fan nozzle, including: (i) an inlet for receiving a gasflow stream of abrasive media entrained in a pressurized gas; (ii) a rectangular opening mated to the inlet; (iii) a rectangular throat extending from the rectangular opening; and, (iv) extending from the throat, a diverging slot outlet diverging at a constant divergence half-angle of about 5 to about 8 degrees, wherein the length of the slot outlet is determined by a slot outlet exit area to throat area ratio of about 2.2 to exactly 2.45; (b) supplying a gasflow stream of abrasive media entrained in a gas pressurized from about 15 to about 80 psig; and, (c) blasting the coating with the gasflow stream from the nozzle outlet.
Claim 6
Independent Claim
141 words
A method for removing a coating from a substrate by abrasive blasting without damaging the substrate, comprising the steps of: (a) providing a supersonic fan nozzle, including: (i) an inlet for receiving a gasflow stream of abrasive media entrained in a pressurized gas; (ii) a rectangular opening mated to the inlet; (iii) a rectangular throat extending from the rectangular opening; and, (iv) extending from the throat, a diverging slot outlet diverging at a constant divergence half-angle of about 5 to about 8 degrees, wherein the length of the slot outlet is determined by a slot outlet exit area to throat area ratio of about 2.2 to exactly 2.45; (b) supplying a gasflow stream of abrasive media entrained in a gas pressurized from about 15 to about 80 psig; and, (c) blasting the coating with the gasflow stream from the nozzle outlet.
Claim 7
Dependent Claim
82 words
The method for removing a coating from a substrate according to claim 4, wherein: (a) the rectangular opening is about 1.57 inches wide and about 0.060 inch to about 0.187 inch high; (b) the rectangular throat is about 1.57 inches wide, of constant height of about 0.060 to about 0.187 inch, and about 1 inch long; and, (c) the diverging slot outlet is of constant height of about 0.060 to about 0.187 inch and diverges from a width of about 1.57 inches.
Claim 8
Independent Claim
181 words
A method for removing a coating from a substrate by abrasive blasting, comprising the steps of: (a) providing a supersonic fan nozzle, including: (i) an inlet for receiving a gas flow stream of abrasive media entrained in a pressurized gas; (ii) a rectangular opening mated to the inlet; (iii) a rectangular throat extending from the rectangular opening; (iv) extending from the throat, a diverging slot outlet diverging at a constant divergence half-angle of about 5 to about 8 degrees, wherein the length of the slot outlet is determined by a slot outlet exit area to throat area ratio of about 2.2 to exactly 2.45; and, (v) wherein the height of the slot outlet is not constant and contracts from where the slot outlet meets the throat to a final outlet height of the slot outlet at a slot height contraction half-angle of about 0.25 to about 1.5 degrees; (b) supplying a gasflow stream of abrasive media entrained in a gas pressurized from about 15 to about 80 psig; and, (c) blasting the coating with the gasflow stream from the nozzle outlet.
Claim 9
Independent Claim
181 words
A method for removing a coating from a substrate by abrasive blasting, comprising the steps of: (a) providing a supersonic fan nozzle, including: (i) an inlet for receiving a gas flow stream of abrasive media entrained in a pressurized gas; (ii) a rectangular opening mated to the inlet; (iii) a rectangular throat extending from the rectangular opening; (iv) extending from the throat, a diverging slot outlet diverging at a constant divergence half-angle of about 5 to about 8 degrees, wherein the length of the slot outlet is determined by a slot outlet exit area to throat area ratio of about 2.2 to exactly 2.45; and, (v) wherein the height of the slot outlet is not constant and contracts from where the slot outlet meets the throat to a final outlet height of the slot outlet at a slot height contraction half-angle of about 0.25 to about 1.5 degrees; (b) supplying a gasflow stream of abrasive media entrained in a gas pressurized from about 15 to about 80 psig; and, (c) blasting the coating with the gasflow stream from the nozzle outlet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |